Answer
Almost all tetrahedral complexes are high-spin because of their reduced ligand-metal interactions. The d orbits in a tetrahedral complex interact only with four ligands, rather than the six that are in the octahedral complex. As a result, the value of $\Delta$ is generally smaller.
Work Step by Step
Almost all tetrahedral complexes are high-spin because of their reduced ligand-metal interactions. The d orbits in a tetrahedral complex interact only with four ligands, rather than the six that are in the octahedral complex. As a result, the value of $\Delta$ is generally smaller.
